Cognomen Grayum (Grayum 
) , across the world, is a rare last name. The surname Grayum is characteristic of Northern America, particularly the United States, where it is a very rare surname, and Canada, where it is an extremely rare surname. Very seldom, Grayum is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Grayum | United States, Canada |
| michael howard grayum American botanist (born 1949), US (b. 1949) |
|
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